Cylindrical honing tool



Jan. 7, 1930. w. F. EMERSON CYLINDRIGAL HONING TOOL Filed April 8, 1927 l llllllllllllllllllllllll A TTORIVEY Patented Jan. 7, 1930 UNITED STATES WILLIAM F. EMERSON, OF WILLIAMSVILLE, NEW YORK CYLINDRICAL HONIN G TOOL Application filed April 8,

This invention relates to the art of grinding or resizing of the cylinder walls or bores of automobile and like internal combustion motors and consists of an improved honing or grinding tool particularly adapted for performing the operat1on of grmdmg 111 a materially simplified manner and with resulting economy.

Important features of the improved device of the present invention include the provision 9f an adjustable stop operable, throughout a wide range of adjustment, initially to adapt or establish the maximum operating diameter of the tool with reference to varied sizes of cylinder bores to be operated upon. A further important feature thereof consists in the provision of a supplemental stop adjustment adapted conveniently and effectively to vary the stop adjustment for positively and accurately determining or limiting the oversize or maximum diameter of the grinding operation and finished bore as desired. The latter feature is of a special form and arrangement suitable for fine or minute adjustment for closely determining the extent or degree of the grinding action. The improved features of the present invention are preferably incorporated in the type of honing tool designed to be rotated by a portable motor so as to be capable of manual manipulation in the grinding 'or resizing of scored or worn cylinders and which as employed in the resizing of removable block type of motor, more particularly, allows of the operation being performed without removing the motor block and possesses other advantages resulting in substantial economy.

The described and other valuable features do and advantages of the present invention will be understood by reference to the accompanying drawing, wherein like reference numerals are applied to the corresponding parts in the several views.

Referring to the drawings:

Fig. 1 is a central vertical sectional view'of a desirable embodiment of the features of the present invention.

Fig. 2 is a view thereof in side elevation. Fig. 3 is a cross sectional: view take online 1927. Serial No. 181,970.

3-3 of Fig. 1 and Fig. 4 is a cross sectional view on line 4-4 of Fig. 1.

In the approved embodiment of the features of the invention, as illustrated in the drawings, 1 indicates a centrally positioned supporting shaft having its upper portion threaded at 2 and having fitted and secured thereto upper and lower bearing collars 3 and 4. The bearing collars 3 and 4, as shown, are rigidly secured to the shaft by pins 5. The collars are each provided with concentrically arranged and equidistantly spaced apertures 6, three in number as shown, within which are fitted bearing studs or pins 7. The bearing pins of the upper and lower col- 5 lars are in axial alignment and pivotally mounted on each pair of aligned bearing pins or studs 7 there is journalled a carrier member or tray 8 of suitable form and length to support the grinding or honing stones indicated at 9. The outer or body portions of the trays 8 are of channel formation and the inner portions thereof are formed as curved or arcuate arms 11, having at their inner ends apertured bearing collar portions 10 within which are fitted the bearing pins 7 whereby the trays are pivotally supported in concentric relation to the supporting shaft 1. The trays are, accordingly, adapted to assume positions of varied radial distance from the supporting shaft and means are provided to effect this movement by resilient pressure for moving the trays in unison and to constantly maintain the concentric relation of the several trays with respect to the supporting shaft 1, or longitudinal axis of the tool.

In accordance with the present invention, the means for imparting the outward movement to the trays with resilient or spring pressure comprises a rotatable actuating collar or disc member 12, journalled upon the supporting shaft immediately above the bearing collar 3. The actuating member is connected to each of the tray members 8 by an arcuate arm or link 13, pivotally connected by bearing studs 14 and 15 threaded to the upper end portions of the trays and to the underside of the actuating member 12 respec tively. The operating links 13 are similar in form and the bearing studs 14, 15 are equidistantly spaced in symmetrical relation to the longitudinal axis of the supporting shaft 1, whereby rotation of the actuating member 12 will move the trays in unison while maintaining a symmetrical and constant radial or circumferential relation to the longitudinal axis of the tool.

For rotating the actuating member 12 and for imparting to the stones the desired yielding or resilient outward pressure, a coiled torsion spring 18 is fitted to surround the supporting shaft 1 with its lower end connected to the rotatable member 12 and its upper end portion secured to a fixed or anchor collar member 19 secured to the supporting shaft 1 by means of a set screw 20. With the spring thus secured at its upper end to the collar 19, affixed to the shaft, 1, it will when properly set under tension, operate to rotate the journalled actuating member 12 so as to expand or move the tray members outwardly in unison and into engagement with the cylinder walls to be acted upon to perform the grinding or honing action under the pressures so transmitted.

For the purpose of determinin and limiting the extreme outward movement of the trays, a stop pin 21 is carried by the bearing collar member f in position to be engaged by one of the trays. The stop thus provided is positioned to coincide with the extreme outward position of the trays whereby they are prohibited from being moved past centre, beyond which they would reverse direction in their movement. The provision of the set screw holding means for the collar member 19, provides for conveniently adjusting the tension of the spring 18 by rotating the collar 19 so as to energize the spring to attain the desired pressure. The inner end 22 of the set screw may desirably be tapered or conical in form, as shown, and the supporting shaft 1, provided with a circumferential series of indentures 23 for receiving the point on the set screw, thereby more rigidly to secure the collar 19 in position.

For limiting the operating movement or expansion of the stones with relation to the diameter of the cylinder bore being acted upon, the actuating member 12 is formed with an upwardly extending portion or stop shoulder 25. This stop shoulder 25, upon the rotating and movable member, is positioned to be engaged by a co-acting fixer stop adjustably secured in fixed relation to the supporting shaft 1. The fixed stop member as disclosed is in the form of an enclosing collar 26 having an annular vertical wall surrounding the spring and collar members 19 and formed with a cutaway portion providing stop shoulder 27 in opposed relation to stop 25 of movable member 12. At its upper portion the adjustable stop member 26 is provided with a horizontal wall 28, apertured to fit the supporting shaft 1 and to be rotatable nally threaded locking collar or clamping nut 82, which may desirably have its outer peripheral surface knurled as indicated. Clamping nut 32 is positioned to overlie and engage the upper surface of the wall 28 of stop collar 26 and upon being tightened with relation thereto operates to firmly clamp the stop collar 26 against the upper surface the fixed part 19, positioned thereunder. As will be understood, the engaging surfaces of the wall 28 and of the part 19 may be of suitably roughened finish to obtain a firm securing engagement for retaining the adjustable stop collar 26 in its adjusted position when clamped thereagainst.

The described arrangement allows for the initial setting or adjusting of the tool with relation to the diameter of the cylinder to be operated upon by inserting the tool within the bore and with the adjustable stop collar 26 loosened, or released by the clamping nut 32, allowing the trays and stones to be expanded into pressure engagement with the cylinder wall and thereupon rotating the adjustable stop member 26 into position of en gagement of its stop shoulder 27 with the coacting movable stop of the actuating member 12. This simplified operation, accordingly, accurately adjusts or determines the positions of the co-acting stops with relation to the diameter of the bore being operated upon, thereby giving an accurate adjustment without the aid of a micrometer or other intricate adjusting operation. A positive stop is thereby initially established for the operating diameter of the tool with reference to the cylinder bore and further, in accordance with the invention, there is incorporated therewith an additional or supplemental adjustment for determining the oversize or allowable increment in the operating diameter adapted accurately to determine the amount of metal to be removed and the maximum diameter of the finished bore.

The means for effecting the supplemental adjustment for oversize is associated with the opposed stop shoulders the stop collar 26 and actuating member 12 and consists in providing the shoulder portion 25 of the latter member with a threaded bore to receive an adjusting screw, or threaded stop, 35 having its inner end positioned to be engaged by the stop shoulder 27 and its outer end portion provided with a slotted head portion 36 for manipulation and adjustment with a screw driver. As will be readily understood, subsequent to the initial adjustment described and determined with relation to the bore diameter, retraction of the adjusting screw 35 by a partial or full turn with the aid of a screw driver, provides for additional and relatively minute adjustment of the engaging stops for accurately determining the maximum diameter of the finished bore with relation to its original size and in the grinding operation the diameter of the finished bore is positively and accurately established.

The grinding or abrading stones are desirably of carborundum or equivalent composition and are, as shown, rectangular in cross section and are held within the trays by the set screws 38. The arrangement accordingly, allows of the stones being turned to difierent positions for the renewal of the active abrading surfaces as desired. The driving head member 30, is suitably-formed to have flexible coupling connections with a driving spindle mounted upon the armature shaft of a portable motor. For this purpose, the head member 30 is formed at its upper portion with a central opening 39 having a radial socket extension forming driving shoulders to be engaged by the usual driving pin or stud of the driving spindle. The driving connection thus provided rotatably connects the driving head on supporting shaft 1 to the motor driving spindle with a desired degree of play or flexibility allowing of the motor and grinding tool to be manually supported and manipulated in the honing operation.

As will be understood by reference to Fig ures 3 and 4, the special form of the supporting arms 11 of the tray members is desirable in providing for a particularly wide range of radial adjustment of the stones whereby the tool may be accommodated to cylinder bores of considerably varied sizes. As shown, the supporting arms 11 are of curvilinear form, of an S contour, whereby upon beingmoved into their extreme retracted position, as indicated, clearance is provided for the pivotal bearings 7 The resulting nesting or overlying relation provided for, is further instrumental in allowing for the swinging movement of the trays in an arc of relatively large radius and from centres in close proximity to the axis of the supporting shaft 1, whereby the trays throughout their movement maintain a position substantially radial to the central longitudinal axis of the tool and maintain efi'ective operating relation to the Wall to be acted upon.

My improved device, accordingly, is of few and simple parts having a wide range of ad justment and adapted in the manner described to be intially adjusted and with facility, with relation to the bore to be acted upon and by means of the supplemental adjustment to closely and accurately determine and limit the allowable excess or oversize of the desired honing action. The supplemental or oversize adjustment allows of pr determining the enlargement of the cylinder bore under microscopic regulation and with the setting established permits of honing or resizing all of the cylinder bores of a motor block to a corresponding oversize.

Having described my invention I claim:

1. A device of the character described, comprising in combination, a supporting member, abrasive elements supported upon said member in radially disposed relation thereto, means for normally influencing said abrasive elements outwardly of said supporting member, an adjustable fixed stop member, means for releasably securing the fixed stop member in adjusted position, a co-acting movable stop operatively connected with the abrasive elements and a supplemental stop adjusting means associated with one of the stop members and adapted for fine adjustment for varying the action of the stop member to establish the diameter of the finished bore.

2. A device of the character described, comprising in combination, a supporting shaft, a series of radially disposed carrier members supported upon the supporting shaft to be movable outwardly with relation thereto, a

rotatable actuating member journalled upon the supporting shaft, a coil spring fitted to surround the shaft and secured in fixed relation to the shaft to one end and at its opposite end connected to the actuating member,

pivotal connections from the actuating memher to the carrier members, said spring being energized for normally rotating the actuating member in the direction to effect outward movement of the carrier members, stop means for limiting the outward movement of the carrier members, said stop means consisting of an adjustable fixed stop member, means for releasably securing the fixed stop member in adjusted position, a co-acting movable stop and supplemental stop adjusting means incorporated with one of the stop members and adapted for fine adjustment for varying the action of the stop members to establish the diameter of the finished bore and abrasive elements fitted within the carrier members.

8. A honing tool of the character described, comprising a supporting member, a series of carrier members pivotally supported thereon to be movable outwardly with relation thereto, a rotatable actuating member suitably journalled upon the supporting member, pivotal link connections between the actuating member and the carrier members, an ad justable anchor collar member supported upon the supporting member, means for securing the anchor collar member to the supporting member, a coil torsion spring connected to the anchor collar member and to the actuating member and operative normally to rotate the latter in the direction to expand the carrier members, a stop shoulder upon the actuating member, a co-acting fixed stop member adjustably and rotatably supported upon the supporting member, releasable means for securing the adjustable stop in varied positions of adjustment and abrasive elements fitted to the carrier members.

4:. A honing tool of the character described, comprising a supporting member, a series of carrier members pivotally supported thereon to be movable outwardly with relation thereto, a rotatable actuating member suitably journalled upon the supporting member, pivotal link connections between the actuating member and the carrier members, an adjustable anchor collar member supported upon the supporting member, means for securing the anchor collar member to the supporting member, a coil torsion spring connected to the anchor collar member and to the actuating member and operative normally to rotate the latter in the direction to expand the carrier members, a stop shoulder upon the actuating member, a co-acting fixed stop member rotatably supported upon the supporting member, means for releasably securing the fixed stop member in position of adjustment and a supplemental stop adjusting means associated with one of the stop members and adapted for fine adjustment for varying the action of the stop members to establish the diameter of the finished bore.

5. A honing tool of the character described, comprising a supporting member, a series of carrier members pivotally supported thereon to be movable outwardly *ith relation thereto, a rotatable actuating member suitably journalled upon the supporting member, pivotal link connections between the actuating member, and the carrier members, an adjustable anchor collar member supported upon the supporting member, a coil torsion spring connected to the anchor collar member and to the actuating member and operative normally to rotate the latter in the direction to expand the carrier members, a stop shoulder upon the actuating member, a fixed stop member rotatably adjustable upon the supporting member, means for clamping the fixed stop member in varied positions of adjustment, said fixed stop member being of collar form with an annular wall surrounding the anchor collar and spring elements and provided with a shoulder in opposed relation to the movable actuating member stop, one of said stop members being provided with a supplemental stop adjusting means consisting of an adjustable screw engaging the opposed stop and adapted by its adjustment to vary the action of the stop members to establish the maximum operating diameter of the tool.

6. A honing tool of the character described comprising in combination a supporting shaft, upper and lower bearing collars atlixed to said shaft, a series of carrier members pivotally mounted upon the) bearing collars, a rotatable actuating member ournalled upon the supporting shaft, pivotal link connections from said actuating member to the respective carrier members 8, an anchor collar member rotatably adjustable upon the supporting shaft, a set screw threaded to said anchor collar for securing'it in position of adjustment, said supporting shaft being formed with an annular series of indentures to be engaged by the set screw, a coiled torsion spring connected respectively to the anchor collar member and to the actuating member and adapted normally to rotate the actuating member in the direction to effect outward movement of the carrier members and abrasive elements fitted to the carrier members.

7 A honing tool of the character described, comprising a supporting shaft, a series of carrier members pivotally supported upon the supporting shaft to be movable outwardly with relation thereto, a rotatable actuating member journalled upon the supporting shaft and operatively connected to the carrier members, an anchor collar member secured upon the supporting shaft, a coiled torsion spring connected respectively to the anchor member and to the actuating member, a stop on the actuating member, a co-acting fixed stop member rotatably supported and having a substantially horizontal wall portion engaging the upper surface of the anchor collar member and an annular wall portion enclosing said collar member and spring and provided with a stop shoulder in opposed relation to the actuating member stop, releasable means for clamping the fixed stop member in securing engagement with the anchor member and abrasive elements fitted to the carrier members.

8. A honing tool of the character described comprising a supporting shaft, a series of carrier members pivotally supported upon the supporting shaft to be movable outwardly with relation thereto, a rotatable actuating member journalled upon the supporting shaft and operatively connected to the carrier members, an anchor collar member secured upon the supporting shaft, a coiled torsion spring connected respectively to the anchor member and to the actuating member, a co-acting fixed stop member rotatably supported and having a substantially horizontal wall portion engaging the upper surface of the anchor collar member and provided with a stop shoulder in opposed relation to the actuating member stop, a driving head member threaded to the upper end portion of the supporting shaft, a clamping nut externally threaded thereon in position to engage the fixed stop member for securing it in adjusted position and abrasive elements fitted to the carrier members.

9. A honing tool of the character described comprising a supporting shaft, a series of carrier members pivotally supported upon the supporting shaft to be movable outwardly with relation thereto, a rotatable actuating member journalled upon the supporting shaft and operatively connected to the carrier memhers, an anchor collar member secured upon the supporting shaft, a coiled torsion spring connected respectively to the anchor member and to the actuating member, a co-acting fixed stop member rotatably supported and having a substantially horizontal Wall portion engaging the upper surface of the anchor collar member and an annular Wall portion enclosing said collar member and spring and provided With a stop shoulder in opposed relation to the actuating member stop, a driving head member threaded to the upper end portion of the supporting shaft, a clamping nut externally threaded thereon in position to engage the fixed stop member for securing it in adjusted position and abrasive elements fitted to the carrier member.

Signed at Buifalo, in the county of Erie and State of New York this 8th day of February A. D. 1927.

WILLIAM F. EMERSON. 

